feat: Add new custom theme

assets/themes/blue.scss

@@ -0,0 +1,54 @@
+/**
+ * Black theme for reveal.js. This is the opposite of the 'white' theme.
+ *
+ * By Hakim El Hattab, http://hakim.se
+ */
+
+
+// Default mixins and settings -----------------
+@import "../../themes/reveal-hugo/assets/reveal-js/css/theme/template/mixins";
+@import "../../themes/reveal-hugo/assets/reveal-js/css/theme/template/settings";
+// ---------------------------------------------
+
+
+// Include theme-specific fonts
+// @import url(../../lib/font/source-sans-pro/source-sans-pro.css);
+
+
+// Override theme settings (see ../template/settings.scss)
+$backgroundColor: #00a9e2;
+
+$mainColor: #fff;
+$headingColor: #fff;
+
+$mainFontSize: 32px;
+$mainFont: 'Source Sans Pro', Helvetica, sans-serif;
+$headingFont: 'Source Sans Pro', Helvetica, sans-serif;
+$headingTextShadow: none;
+$headingLetterSpacing: normal;
+$headingTextTransform: none;
+$headingFontWeight: 600;
+$linkColor: #42affa;
+$linkColorHover: lighten( $linkColor, 15% );
+$selectionBackgroundColor: lighten( $linkColor, 25% );
+
+$heading1Size: 2.5em;
+$heading2Size: 1.6em;
+$heading3Size: 1.3em;
+$heading4Size: 1.0em;
+
+section.has-light-background {
+	&, h1, h2, h3, h4, h5, h6 {
+		color: #222;
+	}
+}
+
+section.present.bottom {
+  top: auto !important;
+  bottom: 0;
+}
+
+
+// Theme template ------------------------------
+@import "../../themes/reveal-hugo/assets/reveal-js/css/theme/template/theme";
+// ---------------------------------------------